Android 点击生成二维码

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_38913065/article/details/78488729

先看效果：

输入内容，点击生成二维码：

点击logo图案：

代码：

QRCodeUtil:

package com.example.administrator.zxing;

import android.graphics.Bitmap;
import android.graphics.Canvas;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class QRCodeUtil {
    public static boolean createQRImage(String content, int widthPix, int heightPix, Bitmap logoBm, String filePath) {
        try {
            if (content == null || "".equals(content)) {
                return false;
            }

            //配置参数
            Map<EncodeHintType, Object> hints = new HashMap<>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            //容错级别
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            //设置空白边距的宽度
//            hints.put(EncodeHintType.MARGIN, 2); //default is 4

            // 图像数据转换，使用了矩阵转换
            BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix, heightPix, hints);
            int[] pixels = new int[widthPix * heightPix];
            // 下面这里按照二维码的算法，逐个生成二维码的图片，
            // 两个for循环是图片横列扫描的结果
            for (int y = 0; y < heightPix; y++) {
                for (int x = 0; x < widthPix; x++) {
                    if (bitMatrix.get(x, y)) {
                        pixels[y * widthPix + x] = 0xff000000;
                    } else {
                        pixels[y * widthPix + x] = 0xffffffff;
                    }
                }
            }

            // 生成二维码图片的格式，使用ARGB_8888
            Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix);

            if (logoBm != null) {
                bitmap = addLogo(bitmap, logoBm);
            }

            //必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的，内存消耗巨大！
            return bitmap != null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(filePath));
        } catch (WriterException | IOException e) {
            e.printStackTrace();
        }

        return false;
    }

    /**
     * 在二维码中间添加Logo图案
     */
    private static Bitmap addLogo(Bitmap src, Bitmap logo) {
        if (src == null) {
            return null;
        }

        if (logo == null) {
            return src;
        }

        //获取图片的宽高
        int srcWidth = src.getWidth();
        int srcHeight = src.getHeight();
        int logoWidth = logo.getWidth();
        int logoHeight = logo.getHeight();

        if (srcWidth == 0 || srcHeight == 0) {
            return null;
        }

        if (logoWidth == 0 || logoHeight == 0) {
            return src;
        }

        //logo大小为二维码整体大小的1/5
        float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;
        Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
        try {
            Canvas canvas = new Canvas(bitmap);
            canvas.drawBitmap(src, 0, 0, null);
            canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);
            canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);

            canvas.save(Canvas.ALL_SAVE_FLAG);
            canvas.restore();
        } catch (Exception e) {
            bitmap = null;
            e.getStackTrace();
        }

        return bitmap;
    }
}

MainActivity:

package com.example.administrator.zxing;

import android.content.Context;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ImageView;
import java.io.File;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //内容
        final EditText contentET = (EditText) findViewById(R.id.create_qr_content);
        //显示二维码图片
        final ImageView imageView = (ImageView) findViewById(R.id.create_qr_iv);
        //是否添加Logo
        final CheckBox addLogoCB = (CheckBox) findViewById(R.id.create_qr_addLogo);
        Button createQrBtn = (Button) findViewById(R.id.create_qr_btn);

        createQrBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                final String filePath = getFileRoot(MainActivity.this) + File.separator
                        + "qr_" + System.currentTimeMillis() + ".jpg";

                //二维码图片较大时，生成图片、保存文件的时间可能较长，因此放在新线程中
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        boolean success = QRCodeUtil.createQRImage(contentET.getText().toString().trim(), 800, 800,
                                addLogoCB.isChecked() ? BitmapFactory.decodeResource(getResources(), R.mipmap.qr_logo) : null,
                                filePath);

                        if (success) {
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    imageView.setImageBitmap(BitmapFactory.decodeFile(filePath));
                                }
                            });
                        }
                    }
                }).start();

            }
        });
    }

    //文件存储根目录
    private String getFileRoot(Context context) {
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            File external = context.getExternalFilesDir(null);
            if (external != null) {
                return external.getAbsolutePath();
            }
        }

        return context.getFilesDir().getAbsolutePath();
    }
}
布局：
 activity_main:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.administrator.zxing.MainActivity">

    <EditText
        android:id="@+id/create_qr_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/create_qr_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="生成二维码" />

        <CheckBox
            android:id="@+id/create_qr_addLogo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="添加logo图案" />
    </LinearLayout>

    <ImageView
        android:id="@+id/create_qr_iv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>